Concealed hinge.



UNITED STATES Ariana, union. oLoiifALrHiN, V"oir"ifioS'roN; MASSACHUSETTS; u i concebirse-HINGE. I'

Patented. March 19, 1907.

Appunti@ nai May 2s, iene.4 serai No. 319.039.'

VBeit known that l, O LoF ALTHiN, 4ofI Bos-1 ton, in the county'of-SuHolk andState of Massachusetts, have invented certain new and 'useful Improvements in Concealed Hinges, of which the following is a specifica-- tion. f 1

This invention relates to improvements in concealed hinges.`

More particularly itrelates" to the` art of cabinet-inaking, in which two pieces are v hinged together to produce a joint presenting tothe eye a continuous appearance in all pop sitions which the pieces may-occupy of the general type shownin the-drawings erewith. `2In joints of this type in Work ofthe highest:

grade it is an important object te have `the that one-ipiece can .swing of the other piece.

point of good workmanship to devise a joint which can be made by ordina Workmen with 'formly satisfactory -resu ts. lnthe best "joints previouslymade the hinge has'- been set intona recess or channel on the under side of thejoined pieces, and the place where -this channel intersects the edge' presents anJ unsightly appearance.' 0 Thee ort to conceal the mutilation of the edge has caused 'the adoption of various expediente; bfut lnone of these` expediente-are reliable, Iexcept 'when executed by'a Workman'ofspecial skill. p It is theobjectof the resent invention to eliminate these dificulti s, providing ,a joint which requires no mutilation of the tabler j edgefand which vcan'be made by an ordinary workman without special skill, thus reducing the ex llense' and increasi the eiqiedition of manu acture, and afjointinwhich the hinge is so arranged that anynumber.' of years of4 use and wear will not cause further mutila tion ofthe joint lsplitting off or breaking out ieces.

T e objects of ltl'ieffini'reiition"are -accom-I plished molding'the facel sidesof `the joined p1ecesas'parallel. concentric quadrants,.respectively couveirand concave, and arranging'abutments adjacent theretoto re ceivethe 'tliiustvwhen` the .two pieces are broughtforcibly-into a straight line and by when arranging a hinge recessed into" the lback sidesof both pieces having its pintle concentric with the quadrants, one leaf or strap of the hinge havlng an arch vaulting from the piece in which the pintle is set passing under the adjacent edge of the quadrant and back into the sameplane in the joined piece. 'Ihe arch makes it unnecessary to niutilate the edge bya channel and absolutely eliminates therefore' beenjoyed without, exposing' a channeled edge, and a' safety-margin isp'rovided in addition equalptothendistance the p'intle-axis yis set into' the piece, through .which margin the piece may swing -before a crack opens between the). two piedi-3S,- -andL when the crack finally doesvappearitsmlines are straight and chastel i ythe thrust from the edge when the pieces are straightened, so thatthe tendency to split oil portions of the edge no lon er eiists- The ull ninety-degrees swing of t e quadrant can In the, accompanying' drawings ,7 '-1 i 'i show s'a section through-'a joint to which vthe inventionis applied looking in directionof the axis of the joint. 'Figj'Z shows the same with the joined pieces in another position.

Fig,` 3 shows an'elevation vof the face ofthe joint when in the positionof'Fig. 2. "Fig 4 shows an elevation of the face of thejoint swung pasti'the margin and e.Xposiiigv a i' Referring to the' drawings, 1`representsa l tableXandZ a table-leaf hinged thereto. ,The-invention is f ap l'icable to tables of variouspfdrrns and to ot ervkinds'of cabinetwork, whether-'set horizontally, vertically, oi' otherwise ;"but its use asapplied to 'two piecesI comprising a 4 horizontal table l and 'a leafl hiufge'd thereto sufficiently explains the same, an' for that reason no other'foim is shown.

vInthe drawing the table edge has two po- `ticns---a vertical abutment 3 in the upper art and a portion below molded in lthe crm of a convex quadrant-lofl a 'circle,

IOO

(marked`4 in the drawing.) *The adjacent edge of the-leaf 2 has an'abutment 5 counter to the abutment 3, and the remainingfportion of the edge of the leaf is a concave quadrant 6 of a circle on a slightly-larger radius than that on the edgeof the table.. The taio5 I ble and leaf are hinged together by hinges4 "having leaves or straps 7 and 8, pivoted on a pintle 9, tlie strap 7 eing set into the table,l the strap 8 set into the table-leaf, and the pintle located With-its axis at the center of IIO -the quadrants 4 and 6, so that when swung rubbing upon the other.

Istraigift-. `lint. .y The abutmentjsgj-s. arid-i5., esta@ together. at, the top and-Prevent fthe tablei* It'.4 be .hinefstrap 8 nearest the intle lies adjacent" aboutv the pintlethese quadrant-surfaces slide past 'each other in close proximity,b'ut not in contact, neither surface touching nor raised, thus throwing theftable-and the'leaf intothe smentite, the twegtrspe 7 d s of the, hinggek lie inthe same plana-'forming a leaf from being raised 'above the plane ofthe table. ff, n .i observed that the portionlof eunder portion of te table edge. 1 fl'n. alllhnges known to mein .which the `tableleaf .turns through only ai quadrant 'thishii'ige-v t strap has heretofore `iojected 'straight`fromthe: table-ietf, ,t0-1w eh lit Securely' fastened by screw'swl() to the; intle lyin close to the under side of; the tab e edge, aninthe best work the-'hin e has-lainiii a channel in, thetable edge, suc as Ywould be formedii" the `recess 11 (shown .in dotted lines in Fig.A 4,-)` [Were cut as a channel to the very edge quadrant 4 instead of stopping-short t as it lreally does inthe present invetio 'l clearly shown inFigs. 1 and'2.}f

,t vis a. feature yof the 'present ,investie-ni toj arch the hinge-strap 8 outward l from 'the tab le the, edge of quadrant 4, as at 12".` he result is that the Wood in the edge ofthe quadrant need not be cut away, and, further, there is' no possibility "ofthe metal hinge-'strapcominto contact with the Wood offthe table Each of .the straps .fthef at such edge ,under the effects of continued form known tonie in which thestrap 8'has.

lain close'to the under, surface of the table at the edge of the quadrant 4, as above described,

after a continued usage 'for a period the ad'- jacent parts become Worn, distorted, or compressed alittle, with` the result that when the vtable-leafis lifted forcibly or carelessly the Hstrap 8 comes hard against the 'under edge of the table and shortly causes a portion of said under edge to split off, owing to the long leverage and magniied stress which results j when a table-leaf is lifted by the hand in ordinary use. j By the construction here shown 4)no looseness thus created, however great, can

result-inbreaking out or splitting off the 'wood at theedge of the quadrant, first, be-

cause contact" of the swinging hinge-strap with the under side of the table edge is imossible, owing' to 4:the arch, and, second,

g vkecaus the strain' is received and sustained tby the abutments 3and A5.. kThe arch also l aires the hinge stronger and less likely to bend'.

tlttittt-l j .j A hinge, comprising a Istraps lying in substantia pintle and two ilat ly the same lane .Whenopeng eachof them having screwcles and one. of. .them being formed intov an arch 4fs` ringingv from' and returning to its own Jp ane)b"etvfveen-b the screw-holes of such strap j' and thepintle, whereb the-strap vaults the position occupied by t e edge of the joined y j piece, Without contact with such edge. leaf ,te the p'intle, so that the stra" sI vaults In testimony whereof I have affixed my signature in presence of two Witnesses.

'i OLOF ALTHIN.

Witnessesz- I- OLIvER P. SCHOONMAKER, EvERET'r E'. KENT. 

